本文整理汇总了Java中org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption.createRecoveryContext方法的典型用法代码示例。如果您正苦于以下问题：Java StartupOption.createRecoveryContext方法的具体用法？Java StartupOption.createRecoveryContext怎么用？Java StartupOption.createRecoveryContext使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption的用法示例。
在下文中一共展示了StartupOption.createRecoveryContext方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: loadFSImage
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption; //导入方法依赖的package包/类
private void loadFSImage(StartupOption startOpt) throws IOException {
final FSImage fsImage = getFSImage();
// format before starting up if requested
if (startOpt == StartupOption.FORMAT) {
fsImage.format(this, fsImage.getStorage().determineClusterId());// reuse current id
startOpt = StartupOption.REGULAR;
}
boolean success = false;
writeLock();
try {
// We shouldn't be calling saveNamespace if we've come up in standby state.
MetaRecoveryContext recovery = startOpt.createRecoveryContext();
final boolean staleImage
= fsImage.recoverTransitionRead(startOpt, this, recovery);
if (RollingUpgradeStartupOption.ROLLBACK.matches(startOpt) ||
RollingUpgradeStartupOption.DOWNGRADE.matches(startOpt)) {
rollingUpgradeInfo = null;
}
final boolean needToSave = staleImage && !haEnabled && !isRollingUpgrade();
LOG.info("Need to save fs image? " + needToSave
+ " (staleImage=" + staleImage + ", haEnabled=" + haEnabled
+ ", isRollingUpgrade=" + isRollingUpgrade() + ")");
if (needToSave) {
fsImage.saveNamespace(this);
} else {
updateStorageVersionForRollingUpgrade(fsImage.getLayoutVersion(),
startOpt);
// No need to save, so mark the phase done.
StartupProgress prog = NameNode.getStartupProgress();
prog.beginPhase(Phase.SAVING_CHECKPOINT);
prog.endPhase(Phase.SAVING_CHECKPOINT);
}
// This will start a new log segment and write to the seen_txid file, so
// we shouldn't do it when coming up in standby state
if (!haEnabled || (haEnabled && startOpt == StartupOption.UPGRADE)
|| (haEnabled && startOpt == StartupOption.UPGRADEONLY)) {
fsImage.openEditLogForWrite();
}
success = true;
} finally {
if (!success) {
fsImage.close();
}
writeUnlock();
}
imageLoadComplete();
}